so I just started using Substance Painter and when I import my model as an FBX from Blender the UV's appear fine in the UV window in painter but as soon as I apply any texture it is mapped strangely.
I only have one material on the object, I applied the modifiers and transforms on export, changed up and forward axis and also tried exporting as an OBJ instead of FBX.
Here I just added a random grunge texture to the base colour of a fill layer. No matter what I change I always get this same mapping on the model, even switching to triplaner mapping gives a similar result.
Here is what the generated curvature map looks like from substance.
Here I applied the curvature map as a mask to a fill layer.